Cannot reply to external emails

[simonIOW]

Hi

New Postfix/DoveCot/Fetchmail/Roundcube/Sieve setup on a Raspberry Pi, and I've hit a snag.

I can receive and compose emails from external email addresses, and can reply from other clients (tested fine on my ipad and also SquirrelMail).  Roundcube will let me reply from within the webmail client, but the email never arrives in the recipients account, even though it appears as sent OK.

Everything looks ok (email appears in the sent items, and in mail.log it is showing as sent), so scratching head here, especially as it's working fine for other clients.

Code: [Select]

Aug 28 22:02:16 piserve postfix/pickup[11489]: 1EBBA5F7C1: uid=33 from=<local@mydomain.local>
Aug 28 22:02:16 piserve postfix/cleanup[14154]: 1EBBA5F7C1: message-id=<1d01863c288640efd6714be58135d1cc@mydomain.local>
Aug 28 22:02:16 piserve postfix/qmgr[11490]: 1EBBA5F7C1: from=<local@mydomain.local>, size=873, nrcpt=1 (queue active)
Aug 28 22:02:16 piserve postfix/smtp[14157]: 1EBBA5F7C1: to=<remote@mydomain.remote>, relay=smtp.external.co.uk[123.123.123.123]:25, delay=0.72, delays=0.25/0.17/0.24/0.07, dsn=2.0.0, status=sent (250 OK id=1be7Dc-0005jW-Bs)
Aug 28 22:02:16 piserve postfix/qmgr[11490]: 1EBBA5F7C1: removed

[SKaero]

How does the log file differ for the successful email vs the one that fails?

[alec]

You said the mail is sent. So, the "problem" will be on the receiving end. Maybe Roundcube produces a set of headers that is treated as spammy by the recipient's server? But this you would have to check on the other server.